I heard Italians are producing less because men don't move out of their parents home until they are like in their 40s.
Well I know that I'm pretty young to be saying this, but mine comes once every 3 months aswell... usually like 75-85 days more like but its pretty regular... Maybe she just menstrates less but naturally like me.
well, if she got the morning after pil thats pretty effective. get her to do a test if your that worried!